An Allentown woman has been charged with homicide in the death of her 20-month-old son, whom she had thrown off a city bridge.

Johnesha Monae Perry, 19, of Allentown, was charged Monday with criminal homicide and endangering the welfare of a child.According to an affidavit of probable cause filed by Allentown detectives, on May 3, Perry had her son, Zymeir Perry, in a stroller and walked from her residence to the Hamilton Street Bridge over the Lehigh River.When she got to the middle of the bridge, Perry took the child out of the stroller and held him on the railing of the bridge. She kissed him and then pushed him over the edge. The child fell about 52 feet into the river. Perry then jumped into the river and later was found along the riverbank.Allentown police officers rescued the child, who was not breathing, from the river.The child "appeared to be engorged with water and had a swollen face."Officers could not detect a pulse or heartbeat. The officers performed CPR, but no vital signs could be established.The child was taken by emergency medical personnel to Lehigh Valley Hospital, Salisbury Township, where medical staff administered resuscitative medications.A pulse and blood pressure returned, but the child had to be placed on life support.Perry told police she threw her son off the bridge and that she intended to kill him.Perry, who had been hospitalized, initially was charged with attempted homicide, child endangerment and aggravated assault, and bail was set at $100,000.Perry was taken to Lehigh County Jail on May 7 after she was released from the hospital.There is no bail in homicide cases, and Perry will remain in jail.The child remained in critical condition for six days, at which point he was assessed for brain dead criteria.On Saturday, it was determined that the child was medically brain dead, and all life support was stopped.An autopsy performed Monday determined that the cause of death was complications of blunt-force trauma and drowning."If there is anything else that can be said to be a positive from this sad event, it is that organs of Zymeir have been harvested and perhaps will help to save some other child's life," said District Attorney Martin on Monday.